CO_2, N_2および空気雰囲気下におけるCd(OH)_2のDTA曲線

概要

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The so far obtained reports have shown that three endothermic peaks at 200〜500℃ or the one endothermic peak at 216℃ appeared on the DTA curve of Cd(CH)_2 under the atmosphere air. In this report the thermal decomposition process of Cd(OH)_2 was studied by means of DTA and TG under atmosphere CO_2,N_2 and air. The DTA and TG curves under the atmosphere CO_2,N_2 have not been reported. The one exothermic peak and two endothermic peaks appeared on the DTA curve under the atmosphere CO_2. This exothermic peak was considered to be due to the formation of CdCO_3 and also the two endothermic peaks due to the decomposition of Cd(OH)_2 and CdCO_3. The formation reaction of CdCO_3 occured during the decomposition of Cd(OH)_2,and then the decomposition of CdCO_3 took place when the decomposition of Cd(OH)_2 was completed. It was considered from the results obtained that the following reactions occured during the thermal decomposition of Cd(OH)_2 under atmosphere CO_2 : endothermic peak at 265℃ Cd(OH)_2→CdO+H_2O exothermic peak at 240〜340℃ CdO+CO_2→CdCO_3 endothermic peak at 468℃ CdCO_3→CdO+CO_2
岡山理科大学の論文